Pumping-engine



(No Model.) 2 Sheets-Sheet 1.

J. D. DAVIES.

PUMPING ENGINE. NO. 307,443. Patented Nov. 4, 1884.

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(No Model.) 2 Sheets-Sheet 2.

J. 1). DAVIES;

PUMPING ENGINE. No. 307,443; Patented Nov. 4, 1884.

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JOSEPH DANKS DAVIES, OF NATOHEZ, MISSISSIPPI.

PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 307,4:43, dated November 4 188 Application filed June 28, 1884.

i ing to provide a connection uniting the piston-rods of two reciprocating engines, whereby their movement relative to each other shall be positive and the length of the stroke be determined and controlled by said connection, a further object being to provide improved mechanism for controlling the movement of the valves.

WVith these ends in view my invention 0011- sists in certain features of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan View of a pair of direct-acting pumping-engincs with my improvement attached thereto. Fig. 2 is a similar view showing the connection in a different position. Fig. 3 is a plan view of a convenient supportirig-frame. Fig. at is a transverse section through the line 1 2 of Fig. 3. Figs. 5, 6, 7, and 8 are de tached views of parts, and Fig. 9 is a plan view showing the valves and valve-operating mechanism.

a and a represent cylinders, and b 1) pistonrods connected with the pistons in said cylinders. The opposite ends of the rods b b are represented as connected with the pistons in the pumps 0 c. Beams (Z and d are journaled at one end at e t" to the piston-rods b b, respectively, whiletheir other ends are pivotally united by a pin, e. Arms f f are journaled in stationary bearings g g on opposite sides of each piston-rod, and have their ends pivotally secured to the beams d and d at h and h. The centers of the journals resting in the stationary bearings y and g and the centers of the journals connecting the beams d and d to the piston-rods should lie in the plane of the axis of the piston-rods Z) and b, respectively.

(No model.)

The distances from h to z and from h to 9 should be equal, and the arms f sufliciently far apart to allow the beam (2 to pass between them. The distances from h to t" and from h to 9 should also be equal, but not necessarily be equal to the distance from h to 2'.

The beams (Z and d may be constructed as shown in Figs. 5, 6, and 8, or in any other desired form, and the journals connecting the beams to the rods 1) and b and to the arms may be formed integral with therods and arms or with the beams, or made separately and secured to either the one or the other, as found most convenient. So, also, the journals which support the arms f f maybe formed integral therewith; as shown in Fig. 7, or may be set stationary in the frame and the arms swing thereon, or may be constructed in other ways, as found desirable in practice.

The valves represented in Fig. 9 are of the ordinary construction, and are operated by the rods 76 it, connected with crank-arms Z Z, on the ends, of the journals in the stationary bearings g g, the journals in this case being rigidly secured to the arms f f, and caused to rock as the arms vibrate. It is necessary that the cranlcarms Z Z should have the same general direction, although the direction of both may be reversed, the direction which the arms occupy determining which shall be the leading engine.

The operation of the connection is as follows: Suppose all the j oints to move freely, and suppose the distances h to 2', 71. to g, andh to e to be equal, and the distances h to i, hto g, and hto e to be equal, the distance it to i may or may not be equal to the distance h to i, and suppose the bearings g g to be located in the stationary frame A. It, now, the steam be put 011 to drive the piston in cylinder 0t, Fig. 1, in the direction of the arrow, it could not move when the connection occupied the position shown, on account of the arm f and beam (2 being on center with respect to the pressure of the beam d, and the stationary bearings 9 now stand the force of the thrust; but the piston in cylinder ais now at mid-stroke, and is supposed to have steam-pressure in the direction of the arrow, and as soon as beam d is moved ever so little out of line with the arm f the beam (Z, is free "\l f aiTd beam d are shown in dotted lines. The

the pin 6 until it reaches mid-stroke, at which moment the piston in cylinder at has completed its stroke in the direction of the arrow and the beam d and arm f are on center withrespectto the pressure of the beam (2; but, as noted, the piston of cylinder a is now at mid stroke, and its maximum force will be repeated as the two engines continue to move, and there will be no possible dead-point with regard to the force exerted upon the pin 0, and said pin will be reciprocated in a line at right angles to the piston-rods, and will operate an airpump, liquid-pump, or any machine which a reciprocating motion is adapted to operate without any cross-strain on the piston-rods.

Fig. 2 shows the position of the connection when the piston in a is just completing its stroke in the direction of the arrow and piston in a is just beginning its stroke in direction of arrow, both pistons at this moment moving in the same direction. In Fig 9 the piston in cylinder a is atmid-stroke and the port at is open. The position of the rock-arms piston in cylinder a being at the end of its return-stroke as the piston in cylinder a passes mid-stroke, the swing of armfwill open the port m, and the piston in a will now close the port m, and as the same passes mid-stroke will open port a, and the piston in cylinder at will begin its return. It is quite important that more or less play be allowed for the journals at 12 t" and g g, as the distances h to t, h to g, and h to t", h to g are liable to become slightly unequal because of wear or from an imperfect construction. There are various ways of meeting this. For example, the journal att' may be allowed a limited sliding. motionin aslot formed in thepistonrod I), or the beams may be connected tothe piston-rods by short links.

The above-described connection affords all theadvantages of the crank-engine working duplex or at right angles, but requires no main shaft, and is one of the most, if not the most,compact connected engine ever made for pumping purposes. If the valves be constructed to cushion,the connection will always be under compression. It also permits greater scribed the action or movement of the engine when the bearings g g of arms ff are located at mid-stroke; but for different classes of work it is desirable to alter the location of the con- I nection, as when constructed to drive singleacting pumps, &c., it is necessary to locate the bearings g g of arms ff at one end of the stroke,in order to make the delivery constant, or as an ordinary double-acting pump by causing the pistons to always travel in opposite directions but with varying relative velocities. The connection affords the advantage, when located at the end of the stroke, of working two double-acting steam-cylinders to drive single-acting pumps. This connection may also be attached to any reciprocating parts of the two engines that are connected with the piston or rods, as in some forms of engines it may be desirable to place the said connections in more convenient or desirable positions than between the engines and pumps.

Having thus described my invention,w hat I claim as'new, and desire to secure by Letters Patent, is-

l. The combination, with two reciprocating piston-rods and two sets of arms journaled in stationary bearings in the planes of the-axes ofthe piston-rods, of beams connecting the piston-rods and arms, said beams having their approaching ends pivoted on a pin, substantially asset forth.

2. The combination, with two reciprocating piston-rods and two beams pivotally connected to each other and to the piston-rods, of arms journaled in a stationary frame and pivotally connected to the beams, whereby the pivotal point of connection of the beams is caused to reciprocate at right angles to the piston-rods, substantially as set forth. v

3. The combination, .withtwo reciprocating piston-rods and rock-arms j ournaled in a stationary frame and operated by beams pivotally secured to the piston-rods, arms, and each other, of cut-off valves connected with and operated by crank-arms secured to the journals by the said rock-arms, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSEPH DANKS DAVIES.-

Witnessesz H. O. GRIFFIN, A. H. Fosrnn. 

